For quark models, this dramatic enhancement of the short-range correlations implies a drastic re-tuning of the spin-spin part of the interaction, whether or not it is treated as first-order perturbation, or included non-perturbatively in the model. For the latter option, an example is the AL1 potential [1]}, according to which the interaction of a quark of mass \(m_i\)  and an antiquark of mass \(m_j\)  is
\(V_{ij}(r)= -\frac{\kappa }{r} +\lambda \,r-\Lambda {}+ \frac{2\,\pi \,\alpha }{3\,m_i\,m_j}\frac{\exp (-r^2/r_0^2)}{\pi ^{3/2}\,r^3_0}\,\mathbf {\sigma }_i.\mathbf {\sigma }_j~,\nonumber \\r_0(m_i,m_j)=A\,\genfrac(){}0{2\,m_i\,m_j}{m_i+m_j}^{-B}~,\\m_q=0.315~,\quad m_c=1.836~,\quad m_b=5.227~,\ \nonumber \\\Lambda =0.8321~,\quad B=0.2204~,\quad A=1.6553~,\nonumber \\\kappa =0.5069~,\quad \alpha =1.8609~,\quad \lambda =0.1653~.\nonumber \) 
